Hot-air-generating gas-burner.



- l PA'IIEIN'IED ,JUNE 7,'1904. E. H. SCHWARTZ. A HOT AIR GENERATING GAS BURNER.

APPLIOATION FILED JAN. 20,1904.

No MODEL. 2 SHEETS-SHEET 1.

gg/M' l H @flumgy @New vN0.762,oo2.` PATENTBD JUNE-7.1904.

- E. H. SCHWARTZ.

HOT AIR GENERATING GAS BURNER. v APPLIOATION FILED MN. 2o, 1904. l

No MODEL. v l 2 SHEETS-SHEET 2.

UNiTnD STA-Tes Patented June '21904.

PATENT OFFICE.

HOT-AlR-GENERATING GAS-BURNER.

' SPECIFICATION forming part of Letters Patent No. 762,002, dated June 7, 1904.

To LZZ whom, it maar] concern:

Beit known that I, EDWARD H. SCHWARTZ,

a citizen of the United States, residing at Chicago, in theA county of Cookv and State of Illinois, have invented certain new and useful Improvements in Hot- Air- Generating Gas- Burners, of which the following is a specification. n

My invention relates to improvements in portable burners of the type in which gas and air are mixed to constitute the fuel element and the flames of such mixture is further fed by suitable volumes of fresh air which is heated before it is fed to the burner proper.

My invention is suitable for use as a heater, as a burner for hot-water heaters, as a portable stove for cooking purposes, and as a burner for japanning-ovens, baking-ovens, and various other like uses.

The object of my invention is to produce a device of the class indicated which shall be simple, strong, inexpensive, and capable of pro? ducing an intensely hot arne. These and ysuch other objects as may hereinafter appear.

are accomplished by the devices illustrated in the accompanying drawings, inf which-M Figure 1 is a vertical central section of one embodiment of my invention. Fig. 2 is a horizontal section on the line 2 2 of Fig. 1.

Fig. 3 is a detail; and Figs. I and 5 arean elevation and a plan view, respectively.

Like letters of reference indicate the same parts in the several figures ofthe drawings. Referring by letter to the accompanying drawings, A is a base, perforated or othewise formed so as to admit of a free How thereunder.

B is the main casing of my device, which rests upon the base A and is perforated at its bottom, the perforation through the bottom of the casing B preferablyregistering with a like perforation through the top of the base A. The casing B is also perforated with a plurality of perfor-ations adjacent `to its lower end for the admission of air.

Mounted within the casing B is the burner proper, C, in the form of a hollow-walled shell inclosing a chamber D of a substantially spherical form, open at its top to the atmosof air Application ned January 2o, 1.904. serial No. 189,872.' (N model.)

phere and connecting at its bottom by a passage E with the central perforations through the bottom of the casing B and the top of the base A. The space between the walls of the shell C constitutes a fuel chamber F, which is closed except for the burner-open:- ings Gr, which open inwardly from the upper edge of the shell IC and which, as shown, are in the form of slits, but which obviously may be in the form of other shaped openings, and except also for a port communicatingwith the fuel-conduit H. municates with an air-port I, through which air is admitted, and with a gas-supply pipe J, which is controlled by a valve or cock K. It will be noted that the inner face of the casing B curves toward the burner edge of the shell C and that the outer and inner faces of the shell C curve in a similar direction,

. In the drawings I have for convenience shown a perforated top or cover L, which may conveniently be used and supported by a circular horizontalange M, which extends from the top of the casing B, It is only intended that this top piece L be used when the burner is used as a heater, in which event the top piece L simply serves to prevent direct contact with the Iiames coming through the burner-openings G.

In operation gas is. fed through the gassupply pipe J into the fuel-conduit H and is preferably fed through aV restricted nozzle, such as j', which projects a jet of gas through the gas-conduit H and induces acurrent of air into the gas-.conduit H through the airports I, thereby forming the fuel mixture, which is fed into the fuel-chamber F and is discharged through the burner-openings G.. The fuel mixture lissuing from theburneropenings G beinglighted the shell C becomes quickly and .highly heated, as does also the casing B, but in less degree. The effect of this is that the air within the chamber D in the casing B is quickly expanded and brought to a high temperature-` Fresh air rushingin through the air-port E is immediately heated and expanded within the chamber D, is forced out of the top of the chamberD, and is'thereby fed in a highly-heated condition tothe converging jets of flame which project from The fuel-conduit H comloo drawn in through the air-ports b in the casing B is heated upon the exterior of the shell C, follows around the outer surface of the heated shell D, and is fed in its heated condition toward the center of combustion, the curved walls of the casing B and shell D serving to direct this supply of heated air to the central point of combustion. I Ahave found from actual demonstration that the result of thus feed; ing heated air to the jets of flame projecting from the burner-openings G is to perfect combustion by supplying the fuel mixture issuing from the burner Gr with additional quantities lof oxygen which have been previously brought to a high temperature and by promoting a thorough admixture of all the fuel elements so brought together, with the resultthat the flame produced is of a distinctly green color immediately adjacent to the burner and blends into 'a zone of blue flame, thus evidencing that I attain a perfect combustion of a fuel mixture which contains a very high number of heat units, the green flame being about the hottest flame known and the blue flame being second only to the green llame in intensity. As a further evidence of the perfect combustion so produced it will be found that n-o smoke or other products of combustion escape from the burner and there is no evidence of gas above the burner while thc burner is in operation.

While I have shown my invention embodied in what I consider a convenient, durable, and desirable form, it will be understood that there may be many variations in detail which will suggest themselves under varying conditions without departing from the spirit of my invention.

I claim-- l. A burner, comprising a fuel-chamber surrounding a substantially closed hot -air chamber, said hot-air chamber being provided with walls which converge upwardly to a restricted discharge-port, and being also Yprovided with a restricted inlet-port, said fuelchamber being provided with a plurality of burner-openings arranged to discharge adjacent to said discharge-port.

2. A burner comprising the combination with a substantially closed casing provided with converging walls leading to an opening in the top of said easing, of a hollow shell inclosed within said casing, means for supplying air to the space between said casing and said shell, said shell being provided with double walls forming a fuel-chamber therebetween, and said shell surrounding an air-chamber, means for supplying air to said last-named air-chamber, and means for supplying a fuel mixture to said fuel-chamber, said shell being also pro; ided with a plurality of burner-openings opening out of said fuel-chamber.

E). In a device of the class described, the combination with a casing of generally spherical form and provided with airports adjacent to its base, of a double-walled shell of sub-y stantially spherical form mounted within said casing, a space between the walls of said shell constituting a fuel-chamber, said shell sur-v rounding a substantially spherical hot air chamber opening atits top through said shell and said shell being provided at its upper edge with a series of burner-openings communicate ing with said fuel-chamber, said shell being provided also with a passage of smaller diameter than said hot-air chamber for admitting air to said hot-air chamber, and means for conducting a fuel mixture to said fuelehamber.

4. In a device of the class described, the combination with a casing of substantially spherical form but opening at its top and provided adjacent to its base with ports for the admission of air to its interior, of a double walled shell of substantially spherical form but open at its top, mounted within said easing so as to provide a hot-air chamber between said shell and said casing and communicating directly with said air-ports, said shell inclosing said hot-air chamber which opens through the top thereof, said shell being provided with an air-port for supliilying air to the base of said hot-air chamber and with a plurality of converging burner-openings which extend through the upper edge of said shell into the space between the double walls of said shell, which space constitutes a fuel-chamber, a conduit leading to said fuel-chamber, and means for supplying a fuel element to said conduit, said conduit heilig provided with a port for the admission of air therein, substantially as described.

5. rIhe combination with a substantially closed casing provided with air-ports adjacent to its base and with an opening at its top, of a double-walled shell mounted within said easing, the space between the walls of said shell constituting a fuel-chamber, said shell surrounding a hot-air chamber opening at its top through said shell, and said shell being provided near its upper edge with a series of burner openings communicating with said fuel-chamber, said shell being provided also with a passage of smaller diameter than said hot-air chamber for admitting air to said hotair chamber, and means for conducting said fuel mixture to said fuel-chamber.

EDIVARI) H. SCI I lVAbflZ.

lVitnesses:

M. IG. Sluiclins, Gr. \Y. DAN Kwam).

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